Thanks for that, I appreciate your help, have printed it off so I can have a real good read.
Nellie is just about to have her next seizure, shes started twitching and has a vacant expression, I really dont know if we can tolerate the stress both to us and her, we'll see if the vets madication helps her, but if it doesnt - is it really worth letting her suffer so, she isnt the dog we used to know, she has really changed - or am i just having a bad night?

You are having a bad night. Things will be a lot different when she is on medication. It's not often that the medication will not work and it does take a few months to get things right. When she gets used to it, it will be as nothing has happened. Yes once in a while there will probably be a seizure but if you keep a diary you will know when to expect one and can take the appropriate measures to make sure she is safe etc.
Don't get too down at this point in time - she has not seen the vet yet. Things will be different once meds are started.